Mine came factory calibrated at 103F Adjusting it was a pain, that tiny little red knob hidden under the cap is not fun to deal with. I also had an issue with temp variation. With the unit flat I got 99.5 With it tipped the top eggs were over 100 and the bottom ones were 98 something. I emailed customer support and they basically told me to buy the auto turn cradle which turns the eggs constantly to compensate for the temp variation. So I got the turner. It works fine now. I guess.Thanks guys. So, essentially I just bought this incubator as my homemade one was cooking them, and now you're telling me that these are innacurate and cook them too...fantastic. Sigh.I thought that Brinsea "factory calibrated" them? And quote the booklet " All Brinsea incubators are designed first and foremost to provide the best control of temperature possible"...